A Mary Sue to a cerain extent overlaps with the Drama Queen area as well. Mary Sues are typically identified as being "perfect" characters or some of their flaws/talents are outrageously unrealistic. If someone is incredibly good looking, is intelligent, strong, brave, with psychic powers, rainbow eyes, etc etc, they are a Mary Sue. Mary Sues also tend to suffer through unrealistic hardships, making them fall partially into the Drama Queen category. They tend to have survived slavery to a man that rap.ed them twelve times a day in some unknown country by having stabbed him with a rusty spoon and are now amazingly successful business women with three beaus on the side and amazing looks after ten kids.

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A negative reference to a female character
commonly used by beginning writers in their Fan-fiction.

Most times, the "Mary-Sue" is based upon the author.
She is unusually perfect and more advanced, also befriends
or becomes romantically entangled with the author's favorite
character/characters from the series. Because she is more
superior than the other characters in the work, she mainly
becomes the focus of the fan-fiction, thus ruining whatever
the fan-fiction was about.

As stated above, the name of the character referred to as
the "Mary-Sue" does not matter.

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Mary-Sues are characters who are usually extraordinarily gorgeous, amazingly talented, unusually powerful, and exceedingly attractive to whoever the author has a crush on. They often possess ridiculously fancy and pretentious first names -- Angel, Raven, Jewel, Lorelei Bianca Julia Marizza Snape -- and are very, very annoying.

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An original character (fem.) in fanfic or an original story, usually on the internet, who is far superior to all other characters. She is typically beautiful, intelligent, kind, and in all other ways "perfect". She usually serves as an important part in a pivotal plot element (ie: a prophecy) and becomes romantically involved with the author's favourite character in the story. The internet fiction world runs rampant with these characters.

Example:dracosluvur: My character's name is Alienne Raven Jewel Sassandra Moonflower Romance Shimmer Honeybeam, she came to Hogwarts after being separated from her family in the U.S. and sold into illegal slavery in Japan, she's fluent in both languages and is part Fae. She has snow-white skin, black hair and sparkling eyes that change colour. She's tall, thin and busty, she fills in as the Charms professor sometimes and doesn't really have a house because she's just that unsortable so she has her own luxury room in one of the towers. Almost the entire male population adores her, staff and students, and she gets perfect marks and it figures that she is the one who actually kills voldemort.